This is an HO Scale kit for a Canadian National ex- Grand Trunk Railway center cupola wooden caboose. Some of these cars lasted well into the 1950s, and are a nice break from CN's usual end cupola cars.
The kit includes full detailing- brake wheels, K brakes, brake levers, handbrake wheels, queenposts, toolbox, marker lamps, steps, smoke jack, cupola seats, and end ladders.
I recommend using monofilament fishing line for the truss rods, with Grandt Line turnbuckles. Turnbuckles are too fine to be able to print. The builder will need to supply the usual materials and parts such as trucks, couplers, wire, ACC cement, paint, and decals.